![]() Scanning electron microscopy (SEM) images showed denser microstructure of geopolymers containing 1–2% GP. X-ray diffraction (XRD) analysis indicated that the presence of higher amount of crystalline Na-type chabazite and zeolite phases for using 2% GP. The decline of strength is attributed to the presence of excess unreacted GP particles. However, compressive strength declined with further increase of GP content beyond 2%. ![]() This is attributed to the increment of soluble silica from the GP. The inclusion of 2% GP improved the 28-day compressive strength of heat cured fly ash geopolymer by 18%. The 28-day compressive strength of the fly ash geopolymer without GP was 23 MPa. Geopolymer paste specimens of 50 mm cube were heat cured at 80 ☌ for the first 24 h after casting and then left in ambient conditions. ![]() GP was used at different rates varying from 1 to 5% mass of fly ash and 8 molar NaOH solution was used as the activator. This study investigated the effect of using waste glass powder (GP) as partial replacement of fly ash on the strength and microstructure development of geopolmer binders. ![]()
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